What's YOUR Hero Product?

Recently I was introduced to the concept of the 'hero' product. It's a term cosmetic companies use to describe their cult products - the ones that are their best sellers and perform the best for them.

Needless to say, this got me thinking about my hero products - the stuff I use over and over and basically cannot live without. 8 Hour Cream is one, as is Elizabeth Arden Green Tea scent (yep, I'm a bit of an EA fan alright!) and MAC is really the only brand I buy time and time again for eyeshadow. I'm a fickle creature when it comes to cosmetics to be sure, but we all have our staples, and I want to know what yours are.